On the latest episode of The Hills: New Beginnings, Carter gets upset over rumors that she and Jenner were in an open relationship — something she's strongly denied. However, Pratt isn't so sure about that because he believes she had something “going on” with the "Slide Away" singer while she was filming the reality show.

“It’s tough for me to listen to Kaitlynn complain about people talking about her allegedly open relationship with Brody when we know she had a thing going with Miley,” he told Cosmopolitan. “She already had something going on with her when these scenes were filming — maybe not physically, but definitely emotionally.”

“I would love to know Liam Hemsworth‘s thought on Kaitlynn‘s recent display of ‘common decency.’ You know what I call ‘common decency?’ Getting it on at your Italian villa and not in front of the paparazzi,” he added.

Elsewhere in his interview, Pratt went on to say that he doesn't judge Kaitlynn's decision. "We just don’t want people to lie about their lives. Maybe you shouldn’t have gone on television. It’s called a reality show, hon," he said.

Last month, Cyrus also took to social media to slam allegations that she cheated on her ex. "I can admit to a lot of things but I refuse to admit that my marriage ended because of cheating. Liam and I have been together for a decade. I've said it before & it remains true, I love Liam and always will." she wrote.